Visuospatial attention is the ability of someone to attend to and to process stimuli in the surrounding space. Vision and visuospatial attention play a central role in everyday life. Deficits of visuospatial attention, such as hemineglect, have been linked to difficulties in activities of daily living, to impaired motor control and to trouble reaching and grasping. Hemineglect has been widely studied in adult stroke patients. However, there is a lack of data on visuospatial attention deficits in congenital brain lesions such as in children with cerebral palsy, a motor impairment due to brain damage occurring during the prenatal, perinatal or early postnatal life. This PhD thesis aims at answering two questions: (1) what is the prevalence of ego and allocentric visuospatial attention deficits in children with USCP? (2) can we treat visuospatial deficits in children with USCP?